Question

what are the different ways in which glucose is oxidised to provide energy in various organisms?

Answer 1

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In this case pyruvate is converted into ethanol and carbon dioxide. In aerobic respiration, breakdown of pyruvate takes place in presence of oxygen to give rise 3 molecules of carbon dioxide and water. The release of energy in aerobic respiration is much more than anaerobic respiration

Answer 2

glucose was convert into pyruvate.

pyruvate in absence of oxygen it convert in to ethnol+energy+Co2.
pyruvate in presence of oxygen it convert into co2+energy+water.
pyruvate in lack of oxygen it convert into latic acid+energy.

glucose (6 carbon molecule)
pyruvate (3 carbon molecule)